Low-temperature selective catalytic reduction of NOx with NH3 over metal oxide and zeolite catalysts-A review
Low-temperature selective catalytic reduction of NOx with NH3 over metal oxide and zeolite catalysts-A review
复制标题
金属氧化物和沸石催化剂上NH3低温选择性催化还原NOx综述
DOI：
10.1016/j.cattod.2011.03.034
复制
发表时间：
2011-10-25
期刊：
影响因子：
5.3
通讯作者：
Yang, Ralph T.
中科院分区：
文献类型：
--
作者：
Li, Junhua;Chang, Huazhen;Yang, Ralph T.
低温（100-300 ℃）催化技术对工业烟气和柴油机尾气中NOx的脱除具有重要意义，但低温氨选择性催化还原NOx（NH3-SCR）催化剂的开发仍是一个挑战，尤其是在200 ℃以下。本文综述了金属氧化物催化剂和金属交换分子筛催化剂两类LTC的研究进展。研究了锰基金属氧化物的制备方法、前驱体和载体对锰基金属氧化物性能的影响。讨论了不同物相的锰氧化物作为最有效的低温活性组分的作用以及在H_2O和SO_2存在下稳定性的极限。本文综述了近几十年来铁、铜交换沸石作为柴油机NH_3-SCR脱硝催化剂的真实的应用前景，并对其活性、选择性和热稳定性与金属、沸石种类及反应条件的关系进行了综述。介绍了锰基催化剂和铁分子筛催化剂的活性中心和反应机理的研究进展，并进行了比较。最后，提出了LTC脱硝技术未来的研究方向。(C)2011爱思唯尔有限公司版权所有。
The removal of NOx by catalytic technology at low temperatures (100-300 degrees C) is significant for flue gas of industry and exhaust gas of diesel engine; however, to develop the low-temperature catalyst (LTC) for selective catalytic reduction of NOx with ammonia (NH3-SCR) is still a challenge especially at temperature below 200 degrees C. This study reviews two types of LTC, the metal oxide catalyst and metal exchanged zeolite catalyst. The performances of Mn-based metal oxide with and without supports have been attempted to correlate with preparation method, precursor, and various supports. The role of manganese oxides with different phases as the most effective low temperature active component and the limitation of stability in the presence of H2O and SO2 are discussed. Fe, Cu exchanged zeolites as potential real application catalysts in diesel engine have been investigated for NH3-SCR of NOx in the past decades, the activity, selectivity and thermal stability related to types of metal, and zeolite, and reaction conditions are reviewed. The research progress in active sites and reaction mechanisms of Mn-based catalyst and Fe-zeolite catalysts are described and compared. Finally, future research directions in the developing LTC for removal of NOx are proposed. (C) 2011 Elsevier B.V. All rights reserved.